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确定屏蔽值的测量技术精密的测试方法能决定有效的屏蔽值。这些数值一经确定,材料的屏蔽效率特性就应写成正式文件列入技术规范中。有三种方法能够测量屏蔽衬垫和屏蔽材料的性能。在军用标准MIL—STD—285中规定了两种通用的测量屏蔽效率(SE)的方法,并由这些方法来确定传输阻抗。尽管它们会得出完全不同的结果。最初军用标准测量屏蔽体电磁性能是在屏蔽室中进行,得到的屏蔽效率数值为分贝,也就是在屏蔽体两
Measurement techniques to determine mask values Sophisticated test methods determine the effective mask value. Once these values have been established, the shielding effectiveness of the material shall be documented in the official specifications. There are three ways to measure the performance of shielding liners and shielding materials. Two general methods for measuring the shielding effectiveness (SE) are defined in the military standard MIL-STD-285, and the transmission impedance is determined by these methods. Although they will produce completely different results. The first military standard to measure the electromagnetic properties of the shield is carried out in the shielded room, the resulting shielding efficiency value of decibels, that is, the shield two